Re: Problem with ffi/forwardInvocation and exception handling on OpenSolaris

[Saso Kiselkov]

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I can catch it in -forwardInvocation:, so it appears that the problem
arises only when I try to go above that frame.

I can't put a breakpoint on parse_lsda_header, it remains in a PENDING
state even after running. When I put a breakpoint on
__gnu_objc_personality_v0, then I get the following behavior (I put a
try/catch in do_throw(), -forwardInvocation: and main()):

(gdb) r
Starting program: /export/home/diablos/excp_fail/obj/excp_fail
warning: Lowest section in /lib/amd64/libpthread.so.1 is .dynamic at
00000000000000b0
warning: Lowest section in /lib/amd64/librt.so.1 is .dynamic at
00000000000000b0
warning: Lowest section in /lib/amd64/libdl.so.1 is .dynamic at
00000000000000b0
throwing

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.
2010-06-28 15:27:21.798 excp_fail[14887] Caught <NSException: 0x497590>
NAME:NSGenericException REASON:test exception INFO:(nil) in do_throw(),
rethrowing...

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.
2010-06-28 15:27:25.242 excp_fail[14887] Caught <NSException: 0x497590>
NAME:NSGenericException REASON:test exception INFO:(nil) in
- -forwardInvocation:, rethrowing...

Breakpoint 1, 0xfffffd7ffdc58bb0 in __gnu_objc_personality_v0 () from
/usr/lib/64/libobjc.so.2
(gdb) c
Continuing.

Program received signal SIGABRT, Aborted.
0xfffffd7fff29e09a in _lwp_kill () from /lib/64/libc.so.1

Does this help in any way?

BR,
- --
Saso

On 06/28/2010 03:04 PM, David Chisnall wrote:
> On 28 Jun 2010, at 13:18, Saso Kiselkov wrote:
> 
>> Sure, I've attached the original source and generated assembly.
> 
> 
> Well, that looks weird.  The unwind data for main() looks correct, but for 
> do_throw and -forwardException:, I can't find the the language-specific data 
> area's header. It appears to be creating the callsite info, but not actually 
> creating any references to it...
> 
> You're using GCC 4.3.3, according to the include stuff, but the generated 
> assembly looks a bit like nonsense.  I wonder if it is trying to make code 
> compatible with a Solaris exception ABI that the GNU runtime knows nothing 
> about?  Even that doesn't seem very likely.  
> 
> You could try putting a breakpoing on __gnu_objc_personality_v0() and then 
> checking that the call to parse_lsda_header() is working correctly for each 
> frame.  
> 
> Can you catch the exception in -forwardInvocation: or does it not even unwind 
> through the do_throw() function?  
> 
> David
> 
> --
> This email complies with ISO 3103
> 

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